Classification
330 - Economics
7
333 - Economics of land & energy
3
551 - Geology, hydrology & meteorology
3
000 - Computer science, information & general works
2
600 - Technology
2
700 - The arts; fine & decorative arts
2
140 - Specific philosophical schools
1
363 - Other social problems & services
1
500 - Natural sciences & mathematics
1
540 - Chemistry & allied sciences
1
580 - Plants (Botany)
1
630 - Agriculture & related technologies
1
800 - Literature & rhetoric
1
900 - History & geography
1